That object above might look like a benign, slightly deformed bowling ball, but it's actually something far more advanced. It's an aquatic robot designed by a couple of MIT researchers, which can surreptitiously inspect the hulls and propeller shafts of ships at port to bust anyone trying to smuggle contraband. The device is perfect for the job, not only because it's small, but also because it doesn't leave visible bubble trails as it moves underwater. Also, its propulsion system's housed within the permeable half of the device itself, so it can potentially hide in clumps of algae to avoid being spotted without getting itself tangled when it starts up. The other half is watertight and houses its circuits, batteries, antenna and other electrical components.